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Evidence for a novel functional role of astrocytes in the acute homeostatic response to high-fat diet intake in mice.

Abstract：

OBJECTIVE:Introduction of a high-fat diet to mice results in a period of voracious feeding, known as hyperphagia, before homeostatic mechanisms prevail to restore energy intake to an isocaloric level. Acute high-fat diet hyperphagia induces astrocyte activation in the rodent hypothalamus, suggesting a potential role of these cells in the homeostatic response to the diet. The objective of this study was to determine physiologic role of astrocytes in the acute homeostatic response to high-fat feeding. METHODS:We bred a transgenic mouse model with doxycycline-inducible inhibition of NFkappaB (NFκB) signaling in astrocytes to determine the effect of loss of NFκB-mediated astrocyte activation on acute high-fat hyperphagia. ELISA was used to measure the levels of markers of astrocyte activation, glial-fibrillary acidic protein (GFAP) and S100B, in the medial basal hypothalamus. RESULTS:Inhibition of NFκB signaling in astrocytes prevented acute high-fat diet-induced astrocyte activation and resulted in a 15% increase in caloric intake (P < 0.01) in the first 24 h after introduction of the diet. CONCLUSIONS:These data reveal a novel homeostatic role for astrocytes in the acute physiologic regulation of food intake in response to high-fat feeding.

journal_name

Mol Metab

journal_title

Molecular metabolism

authors

Buckman LB,Thompson MM,Lippert RN,Blackwell TS,Yull FE,Ellacott KL

doi

10.1016/j.molmet.2014.10.001

subject

Has Abstract

pub_date

2014-10-16 00:00:00

pages

58-63

issue

1

issn

2212-8778

pii

S2212-8778(14)00174-4

journal_volume

4

pub_type

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